"The war between Google and Facebook is heating up: Google just made one small tweak to its Terms of Service that will have a big impact on the world’s biggest social network. From now on, any service that accesses Google’s Contacts API — which makes it easy to import your list of friends’ and coworkers’ email addresses into another service — will need to offer reciprocity. Facebook doesn’t, so it’s going to lose access to this key piece of the social graph."